They were the brothers who started out as petty criminals before using fear and violence to take control of a large part of west Dublin's drugs trade. Devon and Jason Hennessy were part of a new breed of gangland criminal who rose to prominence as the Kinahan Cartel's iron grip was weakened by their feud with the Hutches.

Niall talks to Eimear Rabbitt about Crime World's new five-part subscriber series Blood Brothers tracing the rise and fall of the Hennessy gang.

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